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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Stephan Gerhold <stephan@gerhold.net>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Linux PM list <linux-pm@vger.kernel.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Stephen Boyd <sboyd@kernel.org>, Nishanth Menon <nm@ti.com>,
	nks@flawful.org, Georgi Djakov <georgi.djakov@linaro.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Wolfram Sang <wsa@the-dreams.de>,
	Linux I2C <linux-i2c@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: Re: [PATCH V2 2/2] cpufreq: dt: Refactor initialization to handle probe deferral properly
Date: Fri, 16 Oct 2020 10:33:47 +0530	[thread overview]
Message-ID: <20201016050347.ers54itzmxgijzsy@vireshk-i7> (raw)
In-Reply-To: <CAMuHMdVAJdHVMtK3Sc4sJiJGAwz1J4dKODBFcNzgstaktyKkOw@mail.gmail.com>

On 14-10-20, 18:40, Geert Uytterhoeven wrote:
> On this platform (r8a7791-koelsch.dts), there is no opp table in DT.
> 
>   Before:

I assume this means before this patchset came in..

>     boot:
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:362
>       cpu cpu0: resources_available:95
>       cpu cpu0: resources_available:102: clk_get() returned z
>       cpu cpu0: resources_available:120:
> dev_pm_opp_of_find_icc_paths() returned 0
>       cpu cpu0: resources_available:125: find_supply_name() returned cpu0
>       cpu cpu0: resources_available:132: regulator_get_optional()
> returned -EPROBE_DEFER
>       cpu cpu0: cpu0 regulator not ready, retry
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:371:
> resources_available() returned -517

we deferred probe once.

>       ...
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:362
>       cpu cpu0: resources_available:95
>       cpu cpu0: resources_available:102: clk_get() returned z
>       cpu cpu0: resources_available:120:
> dev_pm_opp_of_find_icc_paths() returned 0
>       cpu cpu0: resources_available:125: find_supply_name() returned cpu0
>       cpu cpu0: resources_available:132: regulator_get_optional()
> returned (ptrval)

found regulator next time.

>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:371:
> resources_available() returned 0
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:375
>       cpufreq_dt: cpufreq_init:162
>       cpu cpu0: cpufreq_init:170: clk_get() returned z
>       cpu cpu0: cpufreq_init:179: dev_pm_opp_of_get_sharing_cpus() returned -2
>       cpu cpu0: cpufreq_init:198: find_supply_name() returned cpu0
>       <i2c comm>
>       cpu cpu0: cpufreq_init:201: dev_pm_opp_set_regulators() returned (ptrval)
>       <i2c comm>
>       cpu cpu0: cpufreq_init:230: dev_pm_opp_of_cpumask_add_table() returned 0
>       cpu cpu0: cpufreq_init:239: dev_pm_opp_get_opp_count() returned 0
>       cpu cpu0: OPP table is not ready, deferring probe

This failed, as we couldn't have deferred probe from cpufreq_init.
Which means that cpufreq didn't work here.

>       cpufreq_dt: cpufreq_init:162
>       cpu cpu1: cpufreq_init:170: clk_get() returned z
>       cpu cpu1: cpufreq_init:179: dev_pm_opp_of_get_sharing_cpus() returned -2
>       cpu cpu1: no regulator for cpu1
>       cpu cpu1: cpufreq_init:198: find_supply_name() returned (null)
>       cpu cpu1: cpufreq_init:230: dev_pm_opp_of_cpumask_add_table() returned 0
>       cpu cpu1: cpufreq_init:239: dev_pm_opp_get_opp_count() returned 0
>       cpu cpu1: OPP table is not ready, deferring probe

Same for CPU1.

> 
>     s2ram:
>       cpufreq_dt: cpufreq_init:162
>       cpu cpu1: cpufreq_init:170: clk_get() returned z
>       cpu cpu1: cpufreq_init:179: dev_pm_opp_of_get_sharing_cpus() returned -2
>       cpu cpu1: no regulator for cpu1
>       cpu cpu1: cpufreq_init:198: find_supply_name() returned (null)
>       cpu cpu1: cpufreq_init:230: dev_pm_opp_of_cpumask_add_table() returned 0
>       cpu cpu1: cpufreq_init:239: dev_pm_opp_get_opp_count() returned 0
>       cpu cpu1: OPP table is not ready, deferring probe

And same here.

>       CPU1 is up
> 
>   After:
>     boot:
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:356
>       cpufreq_dt: dt_cpufreq_early_init:251
>       cpu cpu0: dt_cpufreq_early_init:256
>       cpu cpu0: dt_cpufreq_early_init:271: dev_pm_opp_get_opp_table()
> returned (ptrval)
>       cpu cpu0: dt_cpufreq_early_init:284: find_supply_name() returned cpu0
>       cpu cpu0: dt_cpufreq_early_init:288: dev_pm_opp_set_regulators()
> returned -EPROBE_DEFER
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:360:
> dt_cpufreq_early_init() returned -517
>       ...
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:356
>       cpufreq_dt: dt_cpufreq_early_init:251
>       cpu cpu0: dt_cpufreq_early_init:256
>       cpu cpu0: dt_cpufreq_early_init:271: dev_pm_opp_get_opp_table()
> returned (ptrval)
>       cpu cpu0: dt_cpufreq_early_init:284: find_supply_name() returned cpu0
>       cpu cpu0: dt_cpufreq_early_init:288: dev_pm_opp_set_regulators()
> returned (ptrval)
>       cpu cpu0: dt_cpufreq_early_init:301:
> dev_pm_opp_of_get_sharing_cpus() returned -2
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:360:
> dt_cpufreq_early_init() returned 0
>       cpufreq_dt: dt_cpufreq_early_init:251
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:360:
> dt_cpufreq_early_init() returned 0
>       cpufreq-dt cpufreq-dt: dt_cpufreq_probe:365
>       cpufreq_dt: cpufreq_init:114
>       cpu cpu0: cpufreq_init:124: clk_get() returned z
>       cpu cpu0: cpufreq_init:142: dev_pm_opp_of_cpumask_add_table() returned 0
>       cpu cpu0: cpufreq_init:151: dev_pm_opp_get_opp_count() returned 0
>       cpu cpu0: OPP table can't be empty

Same issue here.

>       cpufreq_dt: cpufreq_init:114
>       cpu cpu0: cpufreq_init:124: clk_get() returned z
>       <i2c comm>
>       cpu cpu0: cpufreq_init:142: dev_pm_opp_of_cpumask_add_table() returned 0
>       cpu cpu0: cpufreq_init:151: dev_pm_opp_get_opp_count() returned 0
> 
>     s2ram:
> 
>       cpufreq_dt: cpufreq_init:114
>       cpu cpu0: cpufreq_init:124: clk_get() returned z
>       WARNING: CPU: 1 PID: 14 at drivers/i2c/i2c-core.h:54
> __i2c_transfer+0x2d8/0x310
>       i2c i2c-6: Transfer while suspended
>       cpu cpu0: cpufreq_init:142: dev_pm_opp_of_cpumask_add_table() returned 0
>       cpu cpu0: cpufreq_init:151: dev_pm_opp_get_opp_count() returned 0
>       cpu cpu0: OPP table can't be empty
>       CPU1 is up
> 
> I hope this helps.

Unfortunately it raised more questions than what it answered :(

-- 
viresh

  reply	other threads:[~2020-10-16  5:03 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-24  9:09 [PATCH V2 1/2] opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER Viresh Kumar
2020-08-24  9:09 ` [PATCH V2 2/2] cpufreq: dt: Refactor initialization to handle probe deferral properly Viresh Kumar
     [not found]   ` <CGME20200901085708eucas1p231ccacd7b41685ece92ee21e3b726f28@eucas1p2.samsung.com>
2020-09-01  8:57     ` Marek Szyprowski
2020-09-01  9:45       ` Viresh Kumar
2020-09-01 10:05         ` Marek Szyprowski
2020-09-01 10:12           ` Viresh Kumar
2020-10-13  9:47   ` Geert Uytterhoeven
2020-10-13  9:56     ` Viresh Kumar
2020-10-14 16:40       ` Geert Uytterhoeven
2020-10-16  5:03         ` Viresh Kumar [this message]
2020-10-16  6:44           ` Geert Uytterhoeven
2020-10-16  8:07             ` Viresh Kumar
2020-10-27 16:29               ` Geert Uytterhoeven
2020-10-28  5:48                 ` Viresh Kumar
2020-10-28  9:49                   ` Geert Uytterhoeven
2020-10-28  9:52                     ` Viresh Kumar
2020-08-24  9:17 ` [PATCH V2 1/2] opp: Allow dev_pm_opp_get_opp_table() to return -EPROBE_DEFER Krzysztof Kozlowski
2020-08-24 11:08 ` Ulf Hansson
2020-08-24 11:39 ` Stephan Gerhold
2020-10-15 18:05 ` Sudeep Holla
2020-10-16  4:24   ` Viresh Kumar
2020-10-16  6:00     ` Sudeep Holla
2020-10-16 11:12       ` Sudeep Holla
2020-10-16 15:28         ` Stephan Gerhold
2020-10-19  4:58         ` Viresh Kumar
2020-10-19  9:17           ` Sudeep Holla
2020-10-19  9:24             ` Viresh Kumar
2020-10-19 10:12               ` Sudeep Holla
2020-10-19 10:35                 ` Viresh Kumar
2020-10-19 14:10                   ` Sudeep Holla
2020-10-20  5:05                     ` Viresh Kumar
2020-10-20  5:54                       ` Viresh Kumar
2020-10-20  9:37                         ` Sudeep Holla
2020-10-20  9:41                           ` Viresh Kumar
2020-10-20  9:52                             ` Sudeep Holla
2020-10-20  9:59                               ` Viresh Kumar
2020-10-27 22:24 ` Guenter Roeck
2020-10-28  4:06   ` Viresh Kumar

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